Tool holder



April 27, 1937. A, ViE HWEGER 2,078,820

TOOL HOLDER Filedliune :50, 1936 Patented Apr. 27, 1937 UNITED STATES rooL HOLDER Albert Viehweger, Berlin, Germany, assignor to Komet Stahlhalter-und Werkzeugfabrik Robert Breuning, Berlin, Germany ApplicationJune' 30, 1936, Serial No.'88,205

Germany April 24, 1936 1 Claim. (Cl. 29-99) This invention relates to a tool-holder, which is intended more particularly for tools with welded-on hard metal plates.

In such tools, withcutting edges of high grade 5 materiahfor instance Widia, it is desirable that one and the same tool should be capable of being used for different cutting angles without changing its shape. For this purpose, according to the invention, there is provided on the toolholder a device which enables the tool to be adjusted to difierent cutting angles. This device preferably consists of a plurality of exchangeable parts, to be fitted or secured to the toolholder, so as not only to enable the tool to be adjusted to different cutting angles, but also at all cutting angles, to provide approximately the same height of cutting edge.

In one particularly advantageous form of construction of the invention the new tool-holder consists of a holder shank, a plurality of exchangeable jaws for receiving the tool, and a screw bolt through the head of which the tool can be passed. The jaws are provided with grooves of suitable inclination. to correspond to the cutting angles for the insertion of the tools.

The invention is illustrated in the accompanying drawing, in which Figure 1 shows a side view of the new toolholder, Figure 2 a plan of the same,

Figure 3 an end view looking in the direction of the arrow A in Figure 1,

' Figure 4 a partial view of the holder shank on a larger scale, Figure 5 a screw bolt of the holder of Figure shown inzperspective, and

Figures 6 and 7, two exchangeable jaws for the holder of Figure 1.

In this drawing, I denotes a shank, on the 40 front end 2 of which is laterally mounted a jam 3. As will be seen from Figures 1, 2 and 3, this 'ing the tool and the jaw to the shank, there serves a screw bolt 6, the cylindrical head 1 of which has a rectangular aperture 8 (compare Figure 5), the cross section of which corresponds'to that of the tool, the tool being in- -"'serted through this aperture.

nut 9, the tool is then pressed lateral] against the jaw 3, and this jaw is thereby at he same time pressed against the end 2 of the shank. In order to prevent the jaw 3 from turning round the screw bolt, the jaw is provided with a lateral rib it, which engages in a correspond- By tightening a ing groove ll, (compare Figures 3 and 4) in the shank. Since this rib Ill can be made comparatively high, an exceedingly firm connection between the jaw and the shank is obtained, which advantageously takes up in a vertical plane the large torque exerted upon the tool 5 when cutting. Any yielding of this connection 10, H is thus precluded, since no screw connection or the like is here employed. The screw bolt 6 employed in the new tool-holder takes up practical- 1y no forces acting upon the tool, since it only serves to'hold the tool -5 laterally in the grooves 4 in the jaw, and 'on the other hand to press the jaw against the shank.

As has already been explained, a number of exchangeable jaws with grooves of different inclinations for the tool are provided for the new tool-holder.

In Figures 6 and 7 two further jaws 3a and 3b are shown-by way of example, of which the former has a very slightly inclined groove M for the tool, corresponding to a small cutting angle. The jaw 3b, on the contrary, has a comparatively steeply inclined groove 4b, corresponding to a large cutting angle.

Now while for all jaws for the same tool holder, the rib .II is always arranged at the same height, the bore I2 for the head I of the screw bolt is located at different heights in the jaws 3, 3a, 3b and so forth, as will be immediately obvious from Figures 1, 6 and '7, the bores I! being so arranged that the cutting edge l3 of the hard metal plate 14 is approximately at the same height for allcutting angles.

In order to enable the screw bolt justed to correspond to the various heights of the bore l2, there is provided in the end 2 of the shank an elongated, vertical slot I5 for the screw bolt, there being also preferably provided, for the head 1 of the screw bolt, another elongated slot I6, milled in the shank. For the jaw is provided with a lateral groove 4 for the insertion of a tool 5 'For the purpose of secur-' s to be ad-- consists in the smallness 'of the number and in the simplicity of the form of the individual parts. The exchangeable jaws are comparatively large,

. so that they are not so liable to be lost, and on the other hand they are also so simply and massively made that they are not likely to be damaged. The changing of the jaws can be very quickly and simply effected, by merely releasing a single member, namely the nut 9, drawing out the tool, and thereupon drawing away the jaw. After mounting another jaw and inserting the tool in the groove 4 and in the slot 8 and tightening the nut 9, the changing of the tool is then completed.

The new tool-holder has the further advantage that on the upper side thereof there are no screws or the like, so that the upper clamping plate of a lathe for example, which is indicated at l8, Figure 1, in the drawing, can be put on right to the front edge of the shank end 2, the tool-holder therefore being very firmly clamped.

What I claim is:--

In an adjustable tool-holder for one type of tool, the combination with a holder member having a shank of substantially rectangular crosssection and a flat-faced head, a groove of substantially rectangular cross-section running parallel to the length direction of said shank provided on a side face of said head, of a flat faced detachable jaw having a rib corresponding to said groove and a lengthways running recess of a cross-section adapted to house said tool located on the side opposite that of said rib, a common securing bolt for said tool and said jaw with a head having a transverse aperture adapted to receive the tool, the holder-head having an elongated slot for the bolt and a counterbore for the bolt-head, the jaw having a bore fitting the bolt head, a nut for the free end of the bolt adapted to firmly hold tool, bolt and jaw together on said holder.

ALBERT VIEHWEGER. 

